Name: graphing inequality solution ranges
Uploaded: 2025-11-26T05:44:15.000Z
Duration: 1 min 24 s
Channel: JoVE

불평등을 그래픽으로 해결하려면 x-값을 선택하고, 함수를 사용하여 해당 y-값을 계산하고, 그래프를 그리는 작업이 포함됩니다.이 그래프는 부등식을 충족하는 x-값을 강조 표시하는 영역을 보여줍니다. 동일한 그리드에 다른 부등식 함수를 표시하고 부등식이 참인 경계선의 측면을 음영 처리합니다.겹치는 영역의 x-값은 부등식의 해를 나타냅니다.이차 함수의 경우 그래프의 음영 처리된 부분은 부등식이 크거나 같을 때의 해를 보여줍니다. 마찬가지로 부등식이 작거나 같으면 해는 그래프의 음영 처리되지 않은 영역에 해당합니다.이차 부등식을 선형 함수와 비교하면 두 그래프가 동일한 좌표 평면에 표시됩니다. 그래프는 점에서 교차합니다. 이러한 x-값은 솔루션 세트의 경계를 표시하여 포물선이 선 위 또는 선에 있는 위치를 보여줍니다.불평등을 해결하는 그래픽 방법은 월별 비용을 예산과 비교할 수 있는 금융과 같은 분야에서 유용합니다. 음영 영역은 지출이 예산 라인 아래에 남아 있음을 보여줍니다.

그래프를 이용한 부등식 풀이

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&#44536;&#47000;&#54532;&#47484; &#51060;&#50857;&#54620; &#54644;&#48277;&#51008; &#44288;&#47144; &#54632;&#49688;&#47484; &#44536;&#47140;&#49436; &#48512;&#46321;&#49885;&#51060; &#52280;&#51060; &#46104;&#45716; &#44396;&#44036;&#51012; &#54032;&#48324;&#54616;&#45716; &#51208;&#52264;&#47196; &#51060;&#47336;&#50612;&#51665;&#45768;&#45796;. &#50696;&#47484; &#46308;&#50612;, &#51060;&#52264;&#48512;&#46321;&#49885; x^2 - 4x + 2 &lt; 0&#51032; &#44221;&#50864; y = x^2 - 4x + 2&#51032; &#44536;&#47000;&#54532;&#47484; &#44536;&#47140;&#49436; &#48516;&#49437;&#54633;&#45768;&#45796;. &#54644;&#45716; &#44257;&#49440;&#51060; x&#52629; &#50500;&#47000;&#50640; &#45459;&#51060;&#45716; &#47784;&#46304; x&#44050;&#51032; &#51665;&#54633;&#51060;&#47728;, &#44536; &#44396;&#44036;&#51060; &#48148;&#47196; &#48512;&#46321;&#49885;&#51060; &#49457;&#47549;&#54616;&#45716; &#50689;&#50669;&#51077;&#45768;&#45796;.
&#46160; &#54632;&#49688; &#44036;&#51032; &#48512;&#46321;&#49885;, &#50696;&#47484; &#46308;&#50612; x^3 - 4x^2 + 8 &#8805; -8&#51032; &#44221;&#50864;&#50640;&#45716; y_1 = x^3 - 4x^2 + 8&#44284; y_2 = -8&#51012; &#44033;&#44033; &#44536;&#47549;&#45768;&#45796;. &#54644;&#45716; y_1 &#8805; y_2&#51064; &#47784;&#46304; x&#47196; &#51060;&#47336;&#50612;&#51648;&#47728;, &#51060;&#45716; y_1&#51032; &#44536;&#47000;&#54532;&#44032; y_2&#51032; &#44536;&#47000;&#54532; &#50948;&#50640; &#51080;&#44144;&#45208; &#49436;&#47196; &#51068;&#52824;&#54616;&#45716; &#44396;&#44036;&#51012; &#51032;&#48120;&#54633;&#45768;&#45796;.
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&#44536;&#47000;&#54532;&#47484; &#51060;&#50857;&#54616;&#50668; &#48512;&#46321;&#49885;&#51012; &#54392;&#45716; &#48169;&#48277;&#51008; ...

Education

교육

JoVE Core

Math Fundamentals

수학 기초

Unit

단위

Coordinates and Graphs

좌표와 그래프

KEY TERMS AND CONCEPTS

핵심 용어 및 개념

Solving Inequalities Graphically

그래픽으로 불평등 해결

graphing inequality solution ranges

Graphing inequality solution ranges gives a visual way to find the x-values that make an inequality true. Students look at where a graph sits compared with the x-axis or with another graph. This shows the interval where the condition is satisfied.

For a quadratic inequality, the first step is to plot the related function. For example, with x² − 4x + 2 &lt; 0, graph y = x² − 4x + 2. The solution is the set of x-values where the curve lies below the x-axis.

Inequalities can also compare two functions. For x³ − 4x² + 8 ≥ −8, graph y₁ = x³ − 4x² + 8 and y₂ = −8. The answer includes all x-values where y₁ is on or above y₂. Graphical methods make these solution intervals easy to spot and help show the shape of the function.

Graphing Inequality Solution Ranges

coordinate plane

Finding Points on the Coordinate Plane

The Cartesian coordinate plane is used to find and plot points in two dimensions. It is made of two number lines that cross at right angles. The horizontal line is the x-axis, and the vertical line is the y-axis. Their meeting point is the origin, where both values are zero. The axes divide the plane into four quadrants. These quadrants are labeled in a counterclockwise direction, starting from the upper right. Every point on the plane is written as an ordered pair. The first number is the...

the distance formula

Finding Distance on a Coordinate Plane

Finding distance on a coordinate plane uses the distance formula and the Pythagorean Theorem. In geometry, this method helps measure the direct distance between two points on a flat plane. It is useful in many practical and theoretical settings. The formula comes from a right triangle. On a coordinate plane, the horizontal and vertical differences between two points become the legs of that triangle. The line connecting the points is the hypotenuse, and that is the shortest path between them. <br...

the midpoint formula

Finding the Center of a Line Segment

Finding the center of a line segment is a key idea in coordinate geometry. The midpoint is the point that lies exactly halfway between two points on a coordinate plane. It is used in mathematics, physics, engineering, and planning work where a central location matters. To work with a midpoint, start with two points, A(x1, y1) and B(x2, y2). A straight line segment can be drawn between them on the coordinate plane. The midpoint, labeled M, divides that segment into two equal parts. The...

graphs of equations in two variables

Plotting Two-Variable Equations with Tables

Plotting two-variable equations with tables helps show how x and y are related. An equation written as y = f(x) or Ax + By = C gives ordered pairs that satisfy the rule. Each pair can be checked by substituting the x and y values into the equation. A value table is a common way to build the graph. Start by choosing several values for the independent variable x. Then substitute each x value into the equation to find the matching y value. The results become ordered pairs on the Cartesian...

circles

Circle Equations in Standard Form

Circle equations in the coordinate plane use a center and a radius to describe every point on the curve. A circle is the set of all points that stay the same distance from a fixed point called the center. That constant distance is the radius. The distance formula connects a point x, y on the circle to the center h, k. The distance between those two points equals the radius r. When both sides of the distance formula are squared, the equation of the circle can be written in standard form. <br...

symmetry

Ellipse Symmetry at the Origin

An ellipse centered at the origin shows clear symmetry in its graph. Its equation describes a smooth, closed curve whose distance from the center keeps a constant ratio between the horizontal and vertical axes. Because the ellipse stretches farther along the x-axis than the y-axis, it has a horizontal shape. This ellipse has symmetry across the x-axis. That means the top half and bottom half are mirror images across the horizontal axis. Algebraically, the equation stays the same when y is...

solving equations graphically

Graphing Equations to Find Intercepts

Graphing equations helps students find intercepts and solutions on the coordinate plane. It gives a visual way to solve equations and understand how a function behaves. To use this method, write the equation in the form y = f(x). The solution to the original equation is the x-value where the graph crosses the x-axis. At that point, f(x) = 0. For example, the linear equation 2x - 4 = 0 can be written as y = 2x - 4. When this function is graphed, it has one x-intercept at x = 2, and that is the...

solving inequalities graphically

Graphing inequality solution ranges gives a visual way to find the x-values that make an inequality true. Students look at where a graph sits compared with the x-axis or with another graph. This shows the interval where the condition is satisfied. For a quadratic inequality, the first step is to plot the related function. For example, with x² − 4x + 2 &lt; 0, graph y = x² − 4x + 2. The solution is the set of x-values where the curve lies below the x-axis. Inequalities can also compare two...

key terms and concepts

Use graphs to find the x-values that satisfy inequalities. Learn how to solve quadratic and two-function inequalities by checking where curves lie on the graph.

Graphing Inequality Solution Ranges | JoVE K12

The JoVE Math Fundamentals collection is designed to build a deep and comprehensive understanding of essential mathematics. Covering the foundations of algebra, geometry, trigonometry, and analytic reasoning, this course establishes a strong base for future studies. The collection connects core mathematical concepts with real-world practice, equipping learners to solve complex problems, master problem-solving skills, and apply abstract ideas.

math fundamentals

Graphing Inequality Solution Ranges

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